/Engine/Source/Editor/SkeletonEditor/Public/IEditableSkeleton.h
Handle drag-drop socket duplication
[USkeletalMeshSocket](API\Runtime\Engine\Engine\USkeletalMeshSocket) * DuplicateSocket ( const struct [FSelectedSocketInfo](API\Editor\UnrealEd\Animation\FSelectedSocketInfo) & SocketInfoToDuplicate, const [FName](API\Runtime\Core\UObject\FName) & NewParentBoneName, [USkeletalMesh](API\Runtime\Engine\Engine\USkeletalMesh) * InSkeletalMesh )